Make core_audio default again and add some extra headers. Mac OS X 10.5.x users please test if it still works.

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3101

src/gui/midi.cpp

@@ -79,8 +79,8 @@ MidiHandler Midi_none;
 
 #if defined(MACOSX)
 
-#include "midi_coreaudio.h"
 #include "midi_coremidi.h"
+#include "midi_coreaudio.h"
 
 #elif defined (WIN32)
 

src/gui/midi_coreaudio.h

@@ -18,6 +18,13 @@
 
 #include <AudioUnit/AudioUnit.h>
 
+//We seem to using very old interface. This keeps it compiling. Maybe
+//somebody will come up with something better oneday.
+#ifdef MAC_OS_X_VERSION_10_5
+#include <AudioUnit/AudioUnitCarbonView.h>
+#include <AudioUnit/AUNTComponent.h>
+#endif
+
 class MidiHandler_coreaudio : public MidiHandler {
 private:
 	AudioUnit m_musicDevice;